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Release 1.0, 1 July 2002 F. Chapter F Memory Management Unit 97
I/D TSB Base Registers
IMPL. DEP. #236
: The width of the TSB_Size field in the TSB Base Register is
implementation dependent; the permitted range is from 2 to 6 bits. The least
significant bit of TSB_Size is always at bit 0 of the TSB Base Register. Any bits
unimplemented at the most significant end of TSB_Size read as 0, and writes to
them are ignored.
On SPARC64 V, the width of the TSB_Size field in the TSB Base Register is 4
bits. The number of entries in the TSB ranges from 512 entries at TSB_Size =0 (8
Kbytes for common TSB, 16 Kbytes for split TSB), to 16 million entries at
TSB_Size = 15 (256 Mbytes for common TSB, 512 Mbytes for split TSB).
F.10.7 I/D TSB Extension Registers
IMPL DEP. in Commonality
FIGURE
F-13: Bits 11:3 in I/D TSB Extension Register
are an implementation-dependent field.
On SPARC64 V, bits 11:0 in I/D TSB Extension Registers are assigned as follows.
■
Bits 11:4 — Reserved. Always read as 0, and writes to it are ignored.
■
Bits 3:0 — TSB_Size field is expanded to be a 4-bit field in SPARC64 V.
F.10.9 I/D Synchronous Fault Status Registers (I-SFSR,
D-SFSR)
IMPL DEP. in Commonality
FIGURE
F-15 and
TABLE
F-12: Bits 63:25 in I/D
Synchronous Fault Status Registers (I-SFSR, D-SFSR) are an implementation-
dependent field.
The format of I/D-MMU SFSR in SPARC64 V is shown in
FIGURE F-3
.
FIGURE F-3
MMU I/D Synchronous Fault Status Registers (
I-SFSR
,
D-SFSR
)
TLB #
reserved
index
reserved
MK EID UE UPA
reserved
mTLB NC
63 62 61 60 59 49 48 47 46 45 32 31 30 29 28 27 26 25
NF ASI TM
reserved
FT E CT PR W OW FV
24 23 16 15 14 13 7 6 5 4 3 2 1 0